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chrome is much easier to clean and will last longer with the Cheaper 7.62x39 ammo and I don't expect MOA accuracy from the AK47 platform
Chrome lining really came about to reduce barrel burn out in rapid fire firearms(specifically the throat area). The military has performed tests and chrome lined verses non chrome lined barrels averages a 1/4 inch difference in accuracy in favor of non chrome lined. in 5.56/223 and 1/2 inch in 7.62x39. The advantages of longer barrel life makes this acceptable for regular shooters but may be an issue for precision shooters. So it really boils down to how you will use the rifle and what you expect out of it accuracy wise. I am a hand loader and can tune my ammunition to my barrel characteristics. On the upbeat, every barrel has a sweet spot load that you just have to experiment a little to find.
1/2 inch accuracy difference would make no difference since my accuracy difference is at least 2 inches